Grinding-mill.



No. 786,657. PATENTED AUG. 18, 1903. P. E. WHITHAM.

GRINDING MILL.

APPLICATION FILED JAN. 13, 1902. N0 MODEL. 2 SHEETS-SHEET 1.

33 I I I INVENTOR PATENTED AUG. 18,- 1903.

F. E. WHITHAM GRINDING MILL.

APPLIGATIGN FILED JAN. 13, 1902.

2 SHEETS-SHEET 2.

N0 MODEL.

ALIA

momma, WASHIN NY 0. c.

FREDRIC EDWARD l/VIIITIIAM, OF OXENIIOPE,

Patented August 18, 1903.

Fries.

ENGLAND.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 736,657, dated August 18, 1903.

Application filed January 13, 1902. Serial No. 89,754. (No model.)

To (all whom, it may concern.-

Be it known that I, FREDRIO EDWARD 'WHITHAM, engineer, a subject of the King of Great Britain, residing at Moorhouse, OXenhope, in the county of York, England, have invented certain new and useful Improvements in Grinding-Mills, of which the following is a specification.

This invention relates to grinding-mills;

and it consists in the novel construction and combination of the parts hereinafter fully described and claimed.

In the drawings, Figure 1 is a sectional side elevation of my improved grinding or reducing apparatus, showing grinding-disks suitable for breaking stones or as a first or preliminary breaker. Fig. 2 is a plan view of apparatus shown at Fig. 1, with top disk or cover removed. Fig. 3 is a side elevation of bottom or rotary disk.

conical sides eprojecting upward, which serve as a hopper by which the mineral or material is admitted to be ground. The inner or grinding surfacesf of these disks are corrugated or fluted in a desired manner.

The bottom or rotary disk 0 is mounted or pivoted upon the vertical driving shaft or spindle g and has a conical center piece 7a, of a greater angle than the conical inlet 6 of the fixed disk I). This stone is also corru- 4o gated or fluted in a similar manner, and both may be made of cast-iron, chilled iron, or manganese steel, with or without plates upon their grinding-surfaces, as desired. The driving-shaft g rests upon an adjustable foot-step j and is supported by suitable bearings 7; and

driven by bevel-wheels m, shaft n, and pulley 1) upon said shaft (not shown) from any suitable source and operates to drive the bottom or rotary disk 0 by means of arms 0',

5o keyed upon said shaft g and resting or fit= ting between dogs .9, cast upon or otherwise attached to the under side of the said disk 0 w is an opening provided in the outer shell or case, preferably one-quarter of its circumference and area, the floor of the grindingchamber inclining at this part to facilitate such discharge.

In order to compensate for uneven density or weight in the materials or metal or wear of the grinding-disks, I provide a suitable balancing arrangement, as follows: Upon the side of the bottom or rotary disk 0 4c in each set or underneath said disk and near its outer periphery I provide or form a suitable T- groove 22 with suitable gaps or openings to admit of the insertion of a suitable plate 23 and bolts 24 underneath this groove 22, and bolted to the aforesaid plate is a suitable weight 25. By slackening the nuts 26 the plate 23 and weight 25 are adjusted within the said groove 22 so as to displace the center of gravity to any required extent and in any desired direction. The nuts are then tightened, so maintaining the whole in perfect balance.

The amount of reduction by the disks may be regulated by moving the said disks nearer to or farther from each other. This operation is accomplished by mounting the vertical driving-shaft upon the adjustable foot-step j. This foot-step consists of a suitable sleeve 32, screwed or threaded upon the outside and working within an internally-screwed casting 33 upon the machine-case a. The shaft end contains a hardened-steel peg, (not shown,) which rests upon suitable hardened steel washers, also contained within the sleeve 32. Upon this screwed sleeve 32 is a worm-wheel 3i, actuated,when required,by a worm 35 upon a longitudinal shaft 36, receiving motion by means of bevel-gear 37, vertical shaft 38, and hand-wheel By these means the wormwheel 34 upon being operated acts upon the screwed sleeve 32 and either raises or lowers the driving-shaft, as desired. Also suitable angle or flanged rings 40 are employed, one attached to or cast upon the bottom or rotary disks 0 at and the other to the floor All of the grinding-chamber i2. These rings 40 are for confining the ground material, preventing same from interfering with the Working parts and assisting in its discharge from the machine.

Having now particularly described and ascertained the nature of my said. invention and l2 mess? the manner in which the same is to be perin the said inlet 6 and having a fiat annular formed, I declare that what I claim is portion around the said center portion, all the In a grinding-mill, the combination, with a said opposed flat and conical portions being I 5 stationary grinding-platebhaving an annular provided with ribs or corrugations f, and a 5 flat portion and a conical inlet 6 at its center driving connection between the said shaft and part, said inlet being smaller in diameter at the plate 0. its top than at its bottom where it joins onto In testimony whereof I hereunto affix my the fiat portion of the said plate, of a drivingsignature in the presence of two Witnesses. 2o

shaft, arevoluble grinding-plate c pivoted on FREDRIC EDWARD WHITHAM. 10 the said shaft and free to rock thereon, said Witnesses:

plate a being provided with a conical and ,ABM. REED,

pointed center portion h which projects with- J. A. BRIGGS. 

